Collet-chuck.



c. T. KADOW. COLLET CHUCK.

. APPLICATION I'ILEI) MAB.. 13,1911.

1,007,786, Patented NOV. 7, 1911.

3 SHEETS-SHEET 1.

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C. T. KADOW.

COLLET CHUCK.

APrLmATloN FILED 11113.13, 1911.

1,007,786, Patented Nov. 7, `1911. a SHEETS-SHEET 2.

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c. T. KADOW COLLET CHUCK.

Patented Nov.7, 1911 3 SHEETS-SHEET 3.

APPLICATION FILED MAB.. 13,1911.

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COLLET-CHUCK.

able that the work to be operated upon be supported and centered asclose to the outer end of the spindle or collet as possible and that theholder engage the work through as great a portion of the circumferenceof the latter as possible. It is also necessary for rapid operation thatthe chuck or holder accurately center the stop without special attentionon the part of the operator, and that it be manipulated from the end ofthe spindle adjacent the tool. and'not from the outer or rear end as isusual in collet machines.

This invent-ion relates to collet chucks and especially to anarrangement thereof which accurately 'centers the work or stock andsupports it close to the end of the spindle and which admits of theadjusting of the collet at the inner end of the spindle to which it maybe attached.

The invention consists in the matters hereinafter set forth, and moreparticularly pointed out in the appended claims.

In the drawings, Figure 1 isa view in longitudinal section of one formof collet chuck that embodies features of the invention; Fig. 2 is aview in 'section on line 2 2 of Fig. 1; Fig. 3 is a view in longitudinalsection of the chuck showing a modification of the operative mechanism;Fig. 4 is a view in section on line 4 4 of Fig. 3; Fig. 5 is a view insection on line 5 5 of Fig'. 3; Fig. 6 is a view in longitudinal sectionof a chuck with tightening means `at the inner end of the chuck; Fig. 7is a view in longitudinal section of a chuck with tightening wrenchapplied to the outer end; Fig. 8 is a view in longitudinal sectionshowing another arrangement of the chuck; Fig. 9 is a View in section online 9 9 of Fig. 8, and Fig. 10 is a partial View in detail showing ashield over the tightening means.

Referring to the drawlngs, a hollow casing 1 or collet is counter-boredand inte- Speciicaton of Letters Patent.

Application` filed March A13, 1911. Serial No. 614,006.

Patented Nov. 7, 1911.

end of a collet or live Spindle 2, of a standard lathe, for example,the'latter preferably having a reduced end 3 and an inner bearriorlythreaded for attachment to the outer ing portion 4 whereby the casing isdrawn i truly onto the live spindle against a flange 5. A sleeve 6 hasan inner enlarged or flanged end 7 reciprocable in the outer bore of thecasing andan outer split end 8 that is formed to fit the outerinteriorly tapered `portion of the casing boreisoqthat inward movementof the slevec'ntracts the split end, the taper of the bore being suchthat the tendency of the contracted end to expand returns the sleeve toits original position.

Two or more radially disposed fingers 9 are pivoted on suitable pins 10or the like in slots 11 of the casing with their inner ends bearingagainst the outer face of the flange 7 of the sleeve 6 and their outerarm portions engaging a collar12 rotatable onthev casing between ashoulder 13 and a remov- Aable stop ring 14 which shields or inclosesthe fingers 9. Cam projections 15 either integrally formed or otherwisesecured on the face of the collar underride and oscillate the fingerssimultaneously when the collar is turned on the casing. This rotationmay be accomplished in the smaller sizes of the chuck by the insertionof a Spanner wrench in a socket 17 in the collar itself, as indicated inFig. l, or other provision may be madeA for rotating it.

Instead of oscillating the fingers by lcams In Figs. 3, 4

om rotation by terior rotatable member 20 that is in screwin the casing,and hold the member 20 in place. In Fig. 6 an outer member 23 inscrewthreaded engagement with the collar has a bevel gear 24 formed onor secured to its face adjacent the live spindle 2. A pinion wrench 25may, by insertion in suitable sockets 26, be turned into mesh with thegear 24 to rotate the latter. As a further detail, hardened bearing pins27 \may be inserted for the lingers toride on. If desired, the

90 on the collar, the latter may be reciprocable f with the sleeve anddepend entirely upon 55- form or arrangement vof parts, except' as set65 end in 4sliding engagement with the Itapered shown wherein a collar33 is reclprocated by an interiorly screwthre'aded annulus 34` which maybe/turne'don' the casing l, if desired, by a pinion wrench'35 meshingwith taper gear teeth 32 formed on the outer end" of the annulus, the'taper insuring a close fit. Ashield' 36 (shown in Fig.`10) may be usedtocover the gear teeth in which case a pinion 37 is mounted in meshtherewith in a suitable bearing bushing 38 in/the casing, a squared orpolygonal wrench bar being inserted through an opening 39 in the shieldinto a squared or polygonal recess 40 inthe pinion to turn the latter.One result .of-this construction is the fact that the sleeve grips thework through a major portion of its circumference close to the collet orlive spindle end so that there is no chattering or vibration.Furthermore any wear `on the beveled face of the casing iscompensatedufor by setting up the collar that throws the {ingers. As thejaws of the sleeve are integral the beveled face of the casing forcentering,

fore accurately hold turned stock in place. As there are no serrationsor projections on vthe jaws they do not enter the face of the work andtherefore doA not mar it, neither is there any ossibility of the workbeing thrown out oi) center, as is the case if the 'jaws are free toindent the surface, in'which 1 case improper centering results if onejaw enters the workfarther than another. As shown in the larger sizes,the chuck ma have an opening (as indicated in F ig.10)v free to receivework of greater diameter than the bore ofthe collet or live spindle sothat larger work maybe readily tooled without the use of a faceplatechuck.

Obviously,` changes in the details of construction may be made withoutdeparting from the spirit of the invention and I do not care to' limitmyself' to any particular forth in the appended claims.

What I claim as my invention l: 1. A collet chuck comprising acylindrical casing adapted at its inner en d for screwthreadedengagementwith the end'of a live spindleand provided at its outbr endwith a tapered bore, a sleeve having a flange on its inner endreciprocable in the cylindrical portion of the casing bore and a split'outer they are always moved uniformly and therey ing with their innerends bearing against portion of the casing bore, pivot pins trans verseto the axis of the casing passing through peripheral slots therein,radially disposedngers pivoted on the pins in the slots with their innerends bearing against the outer face of the inner sleeve lian e and-their outer ends` projecting beyond t e pe- "riphery ofthecasing, acollar on'the casingl adapted when shifted to oscillate 'the arms, and amember rotatable on the cas 75 Ling adapted to engage and inove `thecollar.

2'. A collet chuck comprising a c lindrical'- `casing adapted at, itsinner end or screw.-v threaded centered engagement with the endI Vof alive spindle and provided at its outer end with a tapered bore, a sleevehaving a flange on its. inner end reciprocable in the cylindricalportion of the casing bore and at split outer end in sliding engagementwith the tapered portion of the casin bore, pivot 85 pins transverse tothe axis o thevcasing passing through peripheraly slotsl therein,radially disposed fingers pivoted on the pins in the'slots with theirinner ends bearingl against the outer face of the inner sleeve 'flangeand their outer Vends projecting beyond the periphery of the casin acollar on the casing adapted when shi edto oscillate the arms, a memberrotatable on the casing adapted to engage and move the collar, gearteeth on'an -end of the member, and 'a pinion wrench adapted wheninserted in Ya socket in the casing to-mesh with the gear teeth. Y

3. A collet chuck comprising a cylindrical casing'whose` inner end isfitted to engage 'the screw threads and adjacent portions of 'a livespindle and'whose outerl end is interriorly taper bored, a sleevereciprocable in the casing having aiiange on its inner end 'fitting thecylindrical bore of the casing and la split outer end engaging the taperbore of the casing, fingers pivoted transversely to fthe casing axis inperipheral slots in the casaoV fthe outer annular face of the end flangeof the sleeve and with their outer ends ex- "tending beyond theperiphery of the casing, ia collar movable on the casing between'the'end thereof and the projecting portions of the fingers, bearing memberson the collar contacting with the projecting portions of' Qthe fingersandan annular member rotatable and non-reciprocableon tliecasing adaptedto shift the collar when rotated.

4. A' collet chuck comdprising a cylindrical leasing whose inner en isfitted`to engage fthe screw threads and adjacent portions f :la livespindle and'whose outer end is interiorly taper bored, a sleevereciprocable in `the casing having a flange on its inner end fitting thecylindrical bore of the casing and 4a spllt outer end engaging the taperbore lof the casing, fingers pivoted transversely 'to the casing axis inperipheral slots in the 13" casing with their inner ends bearing againstthe outer annular face of the end flange of the sleeve and'with theirouter ends extending beyond the periphery of the casing, a collarmovable on the casing between the outer end thereof and the projectingp0rtions of the fingers, bearing members on the collar contacting withthe projecting portion of the lingers and an annular member rotatableand non-reciprocable on the casing in screw-threaded engagement with thecollar.

5. A collet chuck comprising a substantially cylindrical casing Whoseinner end is counterbored and screw-threaded for centered engagementwith a live spindle and whose cylindrical bore is tapered at the outerend of the casing, a sleeve of smaller diameter than the. cylindricalbore pr0- vided with a flange 0n its inner end fitting ripheral slots,with the inner ends bearing.

against the outer annular vface of the flange of the sleeve and with theouter ends pro- -jecting beyond the periphery of the casing,

a collar movable on the casing adjacent the fingers with which its outerannular-face is in contact, an annular member rotatable on the casing inscrewthreaded engagement with the collar, forming y a shield for thefingers, and means for rotating the member. In testimony whereof I aiixmy signature in presence of two Witnesses. l

CHARLES T. KADOW. Witnesses: C. R. STICKNEY, A. M. SHANNON.

